bugtraq - [ GLSA 200903-19 ] Xerces-C++: Denial of Service

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Date: Mon, 9 Mar 2009 15:01:23 +0100
From: Robert Buchholz <rbu@...too.org>
To: gentoo-announce@...too.org
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200903-19 ] Xerces-C++: Denial of Service

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Gentoo Linux Security Advisory                           GLSA 200903-19
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Xerces-C++: Denial of Service
      Date: March 09, 2009
      Bugs: #240496
        ID: 200903-19

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Synopsis
========

An error in Xerces-C++ allows for a Denial of Service via malicious XML
schema files.

Background
==========

Xerces-C++ is a validating XML parser written in a portable subset of
C++.

Affected packages
=================

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  dev-libs/xerces-c     < 3.0.0-r1                      >= 3.0.0-r1

Description
===========

Frank Rast reported that the XML parser in Xerces-C++ does not
correctly handle an XML schema definition with a large maxOccurs value,
which triggers excessive memory consumption during the validation of an
XML file.

Impact
======

A remote attacker could entice a user or automated system to validate
an XML file using a specially crafted XML schema file, leading to a
Denial of Service (stack consumption and crash).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Xerces-C++ users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/xerces-c-3.0.0-r1"

References
==========

  [ 1 ] CVE-2008-4482
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4482

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200903-19.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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